You are free to use this data for non-commercial products.
If you use this data, please send us an email telling us. Continued availability of the data depends on continued funding, which depends on the usage of the data. If you use the data or some product based on the data in a publication or elsewhere please include an acknowledgement as follows:
The historical data used here are from the Swedish Meteorological and Hydrological Institute (SMHI), and were produced with support from the Swedish Radiation Protection Authority and the Swedish Environmental Agency.
We would also appreciate to receive an electronic copy of any publication using this data to Weine Josefsson.
From the historical data base you can extract time series, field data and charts with yearly, monthly, daily or hourly resolution.Fill out the form below by choosing a parameter (unit of the result in brackets) together with the dates defining the beginning and end of the time series and the latitude and longitude (decimal notation with negative west of Greenwich) for the location of your interest (default is Norrköping). Data is available from year 1980 to 2000. Requesting long periods of data is somewhat time consuming. As a rule of thumb it will take approximately 30 seconds to retrieve one month of hourly data.
The result is an ASCII file with five columns separated by white space containing the year, month, day, hour and the selected radiation quantity interpolated from the field data using a bilinear method. Click here for more information about units and how to convert between them. The error handling in the retrieval script is extremely simple so please check the output for error messages.
Note that the values are instantaneous and refer to the full hour (UTC). Swedish local time is UTC + 1 h during winter time and UTC + 2 h during the summer. The dates when changing to (at 01.00 UTC, on the last Sunday in March) and from (at 01.00 UTC, on the last Sunday in October) summer time are stated by Swedish law due to EU-directive.
The error when comparing hourly model data with point observations is approximately 40% for the global and the CIE UV irradiance (for sun heights above 25 degrees).